The only real negatives of covering your entire roof with ice water shield are 1 cost and 2 potential ventilation problems which are very rare.
Ice and water shield entire roof cost.
I am putting on a new roof and got two estimates about equal in price.
Roll self adhered roofing underlayment 225 sq.
One roofer said i need an ice water shield on the roof adding that he would put the shield over the asphalt shingles.
Cons of installing ice and water shield on your roof.
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Ice and water protectors sometimes called ice and snow shields in cold climates are made with polymer modified bitumen.
Grip rite grip rite 1 1 4 in.
Ice and water shield on the entire roof deck.
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Ice and water shield the whole roof.
The arguement that oh i would hate to be the next guy having to remove the ice and water shield couldn t you just remove the shingles leave the ice and water down and then put new ice and water on top of the old.
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Stephen eggerman posted in general questions on january 2 2011 11 03am i see this happening in northern new hampshire.
But it costs the customer more money without adding any real value and has the potential to create long term durability problems.
Ice water shield acts as a vapor suppressor so it not only keeps the water out but also keeps the moisture in.